Activation of threaded bolting elements

The article deals with the activation of bolting elements with a thread on them or equipped with threaded bushing through drilling and installation device. The article also enumerates the most frequently used bolting elements of this type and applied equipment with technical parameters in the coal mines of the Ostrava-Karvina coal basin. The essence of the article is primarily to determine the actual height of the induced pre-tension in a bolting element, both in the laboratory and in real mining conditions and to compare these results with used mathematical formulae. The analysis of factors having effect on the level of the induced force and proposals for the limitation and reduction follows. The results show a good agreement of the calculated values with the values actually measured in various conditions. However, the results revealed that the induced input force is low, in the order of tens of kilonewtons. The main significance of the paper is to determine the value of the induced force, influencing factors and proposals to increase this value.Keywords: Anchoring, bolting, drilling device, tensioning forc

Egg Yolk Colour Depending upon the Composition of the Feeding Mixture for Laying Hens

The aim of this study was to verify the possibility of replacement of fish meal by specially treated meal made of yellow lupin seed in relation to the yolk colour. The experiment was performed with 72 laying hens divided into two groups. The experimental group including 36 laying hens received a feeding mixture containing meal made of yellow lupin seed (the JUNO variety) which replaced fish meal used as an animal protein component in feeding mixtures in the control group. Samples of eggs were collected monthly in the course of seven months to determine the colour of egg yolk. Yolk colour was determined by the spectrophotometric method using the CIELAB system. Measurement with the exclusion of gloss was carried out using a portable spectrophotometer. The average values of parameter L* decreased significantly (α = 0.05), which confirmed the darkening of eggs. Parameters a* showed a significant increase (ANOVA α = 0.01), whereas the differences in the individual months ranged from 1.1 to 3.9. Yolk had distinct red-orange colour. Parameters b* did not show significant differences, however, the yolk tended to have an intensive yellow colour. The presence of yellow lupin seed meal in the feeding mixture resulted in a more distinct yellow-red colour of egg yolk

Concurrent Design of Railway Vehicles by Simulation Model Reuse

This paper describes a concurrent design approach to railway vehicle design. Current railway vehicles use many different concepts that are combined into the final design concept. The design support for such systems is based on reusing components from previous design cases. The key part of the railway vehicle design concept is its simulation model. Therefore the support is based on support for reuse of previous simulation models. The simulation models of different railway component concepts are stored using the methodology from the EU CLOCKWORK project. The new concept usually combines stored components

Possibilities of alternative generation II biotests at Artemia

The meaning of alternative biotests is described and discussed. The paper also deals with the possible application of the developmental studies of the sea Artemia franciscana nauplinus. Five-day biotests including the validation criteria are described. The possibilities of the biotests are very wide. Additionally to the standard applications in ecotoxicology, there is a possibility of modelling pharmacological experiments or monitoring the effects of ionizing radiation and the interaction with other chemicals

OpenAIRE guidelines for CRIS managers: supporting interoperability of open research information through established standards

OpenAIRE is the European infrastructure enabling researchers to comply with the European Union requirements for Open Access to research results. OpenAIRE collects metadata from data sources across Europe and beyond and defines interoperability guidelines to assist providers in exposing their information in a way that is compatible with OpenAIRE. This contribution focuses on a specific type of data source, CRIS systems, and the respective OpenAIRE guidelines, based on CERIF XML. A range of issues, spanning different aspects of information representation and exchange, needed to be addressed by the guidelines in order to define a complete solution for interoperability

Simplified Analytical Calculation of PM Machines Magnetic Flux Leakage Factor

The permanent magnets used for generation of magnetic field in permanent magnet machines are placed in more or less magnetically conducting environment – electrical steel and air. This causes leakage of the magnetic flux from its desired path through the air gap. This paper describes simplified analytical calculation of magnetic properties of five most commonly used placements of permanent magnets and compares obtained leakage factors. A verification of the results via finite element method is also included